The Video Training for Legacy (on the CD and on the Internet) has sound problems.
In January 2008, Flash Player Support confirmed there "is a
known issue with Flash Player version 126.96.36.199. This is not
reproducible with earlier versions of Flash Player including
188.8.131.52. It will be fixed."
At this point, Legacy Technical Support is advising users to wait for the release of the next version of the Flash Player. (The complexities involved in going back to version 184.108.40.206 are beyond the abilities of all but the most technically expert pc users and also require downloading a 74.7 MB file. Furthermore, if you have difficulties, Adobe does not provide technical support for earlier versions of its Flash Player.)